| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * Copyright (c) 2013 Nicira, Inc. |
| 4 | */ |
| 5 | |
| 6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 7 | |
| 8 | #include <linux/types.h> |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/skbuff.h> |
| 11 | #include <linux/netdevice.h> |
| 12 | #include <linux/in.h> |
| 13 | #include <linux/if_arp.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/in6.h> |
| 16 | #include <linux/inetdevice.h> |
| 17 | #include <linux/netfilter_ipv4.h> |
| 18 | #include <linux/etherdevice.h> |
| 19 | #include <linux/if_ether.h> |
| 20 | #include <linux/if_vlan.h> |
| 21 | #include <linux/static_key.h> |
| 22 | |
| 23 | #include <net/ip.h> |
| 24 | #include <net/icmp.h> |
| 25 | #include <net/protocol.h> |
| 26 | #include <net/ip_tunnels.h> |
| 27 | #include <net/ip6_tunnel.h> |
| 28 | #include <net/ip6_checksum.h> |
| 29 | #include <net/arp.h> |
| 30 | #include <net/checksum.h> |
| 31 | #include <net/dsfield.h> |
| 32 | #include <net/inet_ecn.h> |
| 33 | #include <net/xfrm.h> |
| 34 | #include <net/net_namespace.h> |
| 35 | #include <net/netns/generic.h> |
| 36 | #include <net/rtnetlink.h> |
| 37 | #include <net/dst_metadata.h> |
| 38 | #include <net/geneve.h> |
| 39 | #include <net/vxlan.h> |
| 40 | #include <net/erspan.h> |
| 41 | |
| 42 | const struct ip_tunnel_encap_ops __rcu * |
| 43 | iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly; |
| 44 | EXPORT_SYMBOL(iptun_encaps); |
| 45 | |
| 46 | const struct ip6_tnl_encap_ops __rcu * |
| 47 | ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly; |
| 48 | EXPORT_SYMBOL(ip6tun_encaps); |
| 49 | |
| 50 | void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, |
| 51 | __be32 src, __be32 dst, __u8 proto, |
| 52 | __u8 tos, __u8 ttl, __be16 df, bool xnet) |
| 53 | { |
| 54 | int pkt_len = skb->len - skb_inner_network_offset(skb); |
| 55 | struct net *net = dev_net(rt->dst.dev); |
| 56 | struct net_device *dev = skb->dev; |
| 57 | struct iphdr *iph; |
| 58 | int err; |
| 59 | |
| 60 | skb_scrub_packet(skb, xnet); |
| 61 | |
| 62 | skb_clear_hash_if_not_l4(skb); |
| 63 | skb_dst_set(skb, &rt->dst); |
| 64 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
| 65 | |
| 66 | /* Push down and install the IP header. */ |
| 67 | skb_push(skb, sizeof(struct iphdr)); |
| 68 | skb_reset_network_header(skb); |
| 69 | |
| 70 | iph = ip_hdr(skb); |
| 71 | |
| 72 | iph->version = 4; |
| 73 | iph->ihl = sizeof(struct iphdr) >> 2; |
| 74 | iph->frag_off = ip_mtu_locked(&rt->dst) ? 0 : df; |
| 75 | iph->protocol = proto; |
| 76 | iph->tos = tos; |
| 77 | iph->daddr = dst; |
| 78 | iph->saddr = src; |
| 79 | iph->ttl = ttl; |
| 80 | __ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1); |
| 81 | |
| 82 | err = ip_local_out(net, sk, skb); |
| 83 | |
| 84 | if (dev) { |
| 85 | if (unlikely(net_xmit_eval(err))) |
| 86 | pkt_len = 0; |
| 87 | iptunnel_xmit_stats(dev, pkt_len); |
| 88 | } |
| 89 | } |
| 90 | EXPORT_SYMBOL_GPL(iptunnel_xmit); |
| 91 | |
| 92 | int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len, |
| 93 | __be16 inner_proto, bool raw_proto, bool xnet) |
| 94 | { |
| 95 | if (unlikely(!pskb_may_pull(skb, hdr_len))) |
| 96 | return -ENOMEM; |
| 97 | |
| 98 | skb_pull_rcsum(skb, hdr_len); |
| 99 | |
| 100 | if (!raw_proto && inner_proto == htons(ETH_P_TEB)) { |
| 101 | struct ethhdr *eh; |
| 102 | |
| 103 | if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) |
| 104 | return -ENOMEM; |
| 105 | |
| 106 | eh = (struct ethhdr *)skb->data; |
| 107 | if (likely(eth_proto_is_802_3(eh->h_proto))) |
| 108 | skb->protocol = eh->h_proto; |
| 109 | else |
| 110 | skb->protocol = htons(ETH_P_802_2); |
| 111 | |
| 112 | } else { |
| 113 | skb->protocol = inner_proto; |
| 114 | } |
| 115 | |
| 116 | skb_clear_hash_if_not_l4(skb); |
| 117 | __vlan_hwaccel_clear_tag(skb); |
| 118 | skb_set_queue_mapping(skb, 0); |
| 119 | skb_scrub_packet(skb, xnet); |
| 120 | |
| 121 | return iptunnel_pull_offloads(skb); |
| 122 | } |
| 123 | EXPORT_SYMBOL_GPL(__iptunnel_pull_header); |
| 124 | |
| 125 | struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, |
| 126 | gfp_t flags) |
| 127 | { |
| 128 | struct metadata_dst *res; |
| 129 | struct ip_tunnel_info *dst, *src; |
| 130 | |
| 131 | if (!md || md->type != METADATA_IP_TUNNEL || |
| 132 | md->u.tun_info.mode & IP_TUNNEL_INFO_TX) |
| 133 | return NULL; |
| 134 | |
| 135 | src = &md->u.tun_info; |
| 136 | res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, flags); |
| 137 | if (!res) |
| 138 | return NULL; |
| 139 | |
| 140 | dst = &res->u.tun_info; |
| 141 | dst->key.tun_id = src->key.tun_id; |
| 142 | if (src->mode & IP_TUNNEL_INFO_IPV6) |
| 143 | memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src, |
| 144 | sizeof(struct in6_addr)); |
| 145 | else |
| 146 | dst->key.u.ipv4.dst = src->key.u.ipv4.src; |
| 147 | dst->key.tun_flags = src->key.tun_flags; |
| 148 | dst->mode = src->mode | IP_TUNNEL_INFO_TX; |
| 149 | ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src), |
| 150 | src->options_len, 0); |
| 151 | |
| 152 | return res; |
| 153 | } |
| 154 | EXPORT_SYMBOL_GPL(iptunnel_metadata_reply); |
| 155 | |
| 156 | int iptunnel_handle_offloads(struct sk_buff *skb, |
| 157 | int gso_type_mask) |
| 158 | { |
| 159 | int err; |
| 160 | |
| 161 | if (likely(!skb->encapsulation)) { |
| 162 | skb_reset_inner_headers(skb); |
| 163 | skb->encapsulation = 1; |
| 164 | } |
| 165 | |
| 166 | if (skb_is_gso(skb)) { |
| 167 | err = skb_header_unclone(skb, GFP_ATOMIC); |
| 168 | if (unlikely(err)) |
| 169 | return err; |
| 170 | skb_shinfo(skb)->gso_type |= gso_type_mask; |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | if (skb->ip_summed != CHECKSUM_PARTIAL) { |
| 175 | skb->ip_summed = CHECKSUM_NONE; |
| 176 | /* We clear encapsulation here to prevent badly-written |
| 177 | * drivers potentially deciding to offload an inner checksum |
| 178 | * if we set CHECKSUM_PARTIAL on the outer header. |
| 179 | * This should go away when the drivers are all fixed. |
| 180 | */ |
| 181 | skb->encapsulation = 0; |
| 182 | } |
| 183 | |
| 184 | return 0; |
| 185 | } |
| 186 | EXPORT_SYMBOL_GPL(iptunnel_handle_offloads); |
| 187 | |
| 188 | /** |
| 189 | * iptunnel_pmtud_build_icmp() - Build ICMP error message for PMTUD |
| 190 | * @skb: Original packet with L2 header |
| 191 | * @mtu: MTU value for ICMP error |
| 192 | * |
| 193 | * Return: length on success, negative error code if message couldn't be built. |
| 194 | */ |
| 195 | static int iptunnel_pmtud_build_icmp(struct sk_buff *skb, int mtu) |
| 196 | { |
| 197 | const struct iphdr *iph = ip_hdr(skb); |
| 198 | struct icmphdr *icmph; |
| 199 | struct iphdr *niph; |
| 200 | struct ethhdr eh; |
| 201 | int len, err; |
| 202 | |
| 203 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr))) |
| 204 | return -EINVAL; |
| 205 | |
| 206 | skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN); |
| 207 | pskb_pull(skb, ETH_HLEN); |
| 208 | skb_reset_network_header(skb); |
| 209 | |
| 210 | err = pskb_trim(skb, 576 - sizeof(*niph) - sizeof(*icmph)); |
| 211 | if (err) |
| 212 | return err; |
| 213 | |
| 214 | len = skb->len + sizeof(*icmph); |
| 215 | err = skb_cow(skb, sizeof(*niph) + sizeof(*icmph) + ETH_HLEN); |
| 216 | if (err) |
| 217 | return err; |
| 218 | |
| 219 | icmph = skb_push(skb, sizeof(*icmph)); |
| 220 | *icmph = (struct icmphdr) { |
| 221 | .type = ICMP_DEST_UNREACH, |
| 222 | .code = ICMP_FRAG_NEEDED, |
| 223 | .checksum = 0, |
| 224 | .un.frag.__unused = 0, |
| 225 | .un.frag.mtu = htons(mtu), |
| 226 | }; |
| 227 | icmph->checksum = ip_compute_csum(icmph, len); |
| 228 | skb_reset_transport_header(skb); |
| 229 | |
| 230 | niph = skb_push(skb, sizeof(*niph)); |
| 231 | *niph = (struct iphdr) { |
| 232 | .ihl = sizeof(*niph) / 4u, |
| 233 | .version = 4, |
| 234 | .tos = 0, |
| 235 | .tot_len = htons(len + sizeof(*niph)), |
| 236 | .id = 0, |
| 237 | .frag_off = htons(IP_DF), |
| 238 | .ttl = iph->ttl, |
| 239 | .protocol = IPPROTO_ICMP, |
| 240 | .saddr = iph->daddr, |
| 241 | .daddr = iph->saddr, |
| 242 | }; |
| 243 | ip_send_check(niph); |
| 244 | skb_reset_network_header(skb); |
| 245 | |
| 246 | skb->ip_summed = CHECKSUM_NONE; |
| 247 | |
| 248 | eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0); |
| 249 | skb_reset_mac_header(skb); |
| 250 | |
| 251 | return skb->len; |
| 252 | } |
| 253 | |
| 254 | /** |
| 255 | * iptunnel_pmtud_check_icmp() - Trigger ICMP reply if needed and allowed |
| 256 | * @skb: Buffer being sent by encapsulation, L2 headers expected |
| 257 | * @mtu: Network MTU for path |
| 258 | * |
| 259 | * Return: 0 for no ICMP reply, length if built, negative value on error. |
| 260 | */ |
| 261 | static int iptunnel_pmtud_check_icmp(struct sk_buff *skb, int mtu) |
| 262 | { |
| 263 | const struct icmphdr *icmph = icmp_hdr(skb); |
| 264 | const struct iphdr *iph = ip_hdr(skb); |
| 265 | |
| 266 | if (mtu < 576 || iph->frag_off != htons(IP_DF)) |
| 267 | return 0; |
| 268 | |
| 269 | if (ipv4_is_lbcast(iph->daddr) || ipv4_is_multicast(iph->daddr) || |
| 270 | ipv4_is_zeronet(iph->saddr) || ipv4_is_loopback(iph->saddr) || |
| 271 | ipv4_is_lbcast(iph->saddr) || ipv4_is_multicast(iph->saddr)) |
| 272 | return 0; |
| 273 | |
| 274 | if (iph->protocol == IPPROTO_ICMP && icmp_is_err(icmph->type)) |
| 275 | return 0; |
| 276 | |
| 277 | return iptunnel_pmtud_build_icmp(skb, mtu); |
| 278 | } |
| 279 | |
| 280 | #if IS_ENABLED(CONFIG_IPV6) |
| 281 | /** |
| 282 | * iptunnel_pmtud_build_icmpv6() - Build ICMPv6 error message for PMTUD |
| 283 | * @skb: Original packet with L2 header |
| 284 | * @mtu: MTU value for ICMPv6 error |
| 285 | * |
| 286 | * Return: length on success, negative error code if message couldn't be built. |
| 287 | */ |
| 288 | static int iptunnel_pmtud_build_icmpv6(struct sk_buff *skb, int mtu) |
| 289 | { |
| 290 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
| 291 | struct icmp6hdr *icmp6h; |
| 292 | struct ipv6hdr *nip6h; |
| 293 | struct ethhdr eh; |
| 294 | int len, err; |
| 295 | __wsum csum; |
| 296 | |
| 297 | if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr))) |
| 298 | return -EINVAL; |
| 299 | |
| 300 | skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN); |
| 301 | pskb_pull(skb, ETH_HLEN); |
| 302 | skb_reset_network_header(skb); |
| 303 | |
| 304 | err = pskb_trim(skb, IPV6_MIN_MTU - sizeof(*nip6h) - sizeof(*icmp6h)); |
| 305 | if (err) |
| 306 | return err; |
| 307 | |
| 308 | len = skb->len + sizeof(*icmp6h); |
| 309 | err = skb_cow(skb, sizeof(*nip6h) + sizeof(*icmp6h) + ETH_HLEN); |
| 310 | if (err) |
| 311 | return err; |
| 312 | |
| 313 | icmp6h = skb_push(skb, sizeof(*icmp6h)); |
| 314 | *icmp6h = (struct icmp6hdr) { |
| 315 | .icmp6_type = ICMPV6_PKT_TOOBIG, |
| 316 | .icmp6_code = 0, |
| 317 | .icmp6_cksum = 0, |
| 318 | .icmp6_mtu = htonl(mtu), |
| 319 | }; |
| 320 | skb_reset_transport_header(skb); |
| 321 | |
| 322 | nip6h = skb_push(skb, sizeof(*nip6h)); |
| 323 | *nip6h = (struct ipv6hdr) { |
| 324 | .priority = 0, |
| 325 | .version = 6, |
| 326 | .flow_lbl = { 0 }, |
| 327 | .payload_len = htons(len), |
| 328 | .nexthdr = IPPROTO_ICMPV6, |
| 329 | .hop_limit = ip6h->hop_limit, |
| 330 | .saddr = ip6h->daddr, |
| 331 | .daddr = ip6h->saddr, |
| 332 | }; |
| 333 | skb_reset_network_header(skb); |
| 334 | |
| 335 | csum = csum_partial(icmp6h, len, 0); |
| 336 | icmp6h->icmp6_cksum = csum_ipv6_magic(&nip6h->saddr, &nip6h->daddr, len, |
| 337 | IPPROTO_ICMPV6, csum); |
| 338 | |
| 339 | skb->ip_summed = CHECKSUM_NONE; |
| 340 | |
| 341 | eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0); |
| 342 | skb_reset_mac_header(skb); |
| 343 | |
| 344 | return skb->len; |
| 345 | } |
| 346 | |
| 347 | /** |
| 348 | * iptunnel_pmtud_check_icmpv6() - Trigger ICMPv6 reply if needed and allowed |
| 349 | * @skb: Buffer being sent by encapsulation, L2 headers expected |
| 350 | * @mtu: Network MTU for path |
| 351 | * |
| 352 | * Return: 0 for no ICMPv6 reply, length if built, negative value on error. |
| 353 | */ |
| 354 | static int iptunnel_pmtud_check_icmpv6(struct sk_buff *skb, int mtu) |
| 355 | { |
| 356 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
| 357 | int stype = ipv6_addr_type(&ip6h->saddr); |
| 358 | u8 proto = ip6h->nexthdr; |
| 359 | __be16 frag_off; |
| 360 | int offset; |
| 361 | |
| 362 | if (mtu < IPV6_MIN_MTU) |
| 363 | return 0; |
| 364 | |
| 365 | if (stype == IPV6_ADDR_ANY || stype == IPV6_ADDR_MULTICAST || |
| 366 | stype == IPV6_ADDR_LOOPBACK) |
| 367 | return 0; |
| 368 | |
| 369 | offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto, |
| 370 | &frag_off); |
| 371 | if (offset < 0 || (frag_off & htons(~0x7))) |
| 372 | return 0; |
| 373 | |
| 374 | if (proto == IPPROTO_ICMPV6) { |
| 375 | struct icmp6hdr *icmp6h; |
| 376 | |
| 377 | if (!pskb_may_pull(skb, skb_network_header(skb) + |
| 378 | offset + 1 - skb->data)) |
| 379 | return 0; |
| 380 | |
| 381 | icmp6h = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
| 382 | if (icmpv6_is_err(icmp6h->icmp6_type) || |
| 383 | icmp6h->icmp6_type == NDISC_REDIRECT) |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | return iptunnel_pmtud_build_icmpv6(skb, mtu); |
| 388 | } |
| 389 | #endif /* IS_ENABLED(CONFIG_IPV6) */ |
| 390 | |
| 391 | /** |
| 392 | * skb_tunnel_check_pmtu() - Check, update PMTU and trigger ICMP reply as needed |
| 393 | * @skb: Buffer being sent by encapsulation, L2 headers expected |
| 394 | * @encap_dst: Destination for tunnel encapsulation (outer IP) |
| 395 | * @headroom: Encapsulation header size, bytes |
| 396 | * @reply: Build matching ICMP or ICMPv6 message as a result |
| 397 | * |
| 398 | * L2 tunnel implementations that can carry IP and can be directly bridged |
| 399 | * (currently UDP tunnels) can't always rely on IP forwarding paths to handle |
| 400 | * PMTU discovery. In the bridged case, ICMP or ICMPv6 messages need to be built |
| 401 | * based on payload and sent back by the encapsulation itself. |
| 402 | * |
| 403 | * For routable interfaces, we just need to update the PMTU for the destination. |
| 404 | * |
| 405 | * Return: 0 if ICMP error not needed, length if built, negative value on error |
| 406 | */ |
| 407 | int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst, |
| 408 | int headroom, bool reply) |
| 409 | { |
| 410 | u32 mtu = dst_mtu(encap_dst) - headroom; |
| 411 | |
| 412 | if ((skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) || |
| 413 | (!skb_is_gso(skb) && (skb->len - skb_network_offset(skb)) <= mtu)) |
| 414 | return 0; |
| 415 | |
| 416 | skb_dst_update_pmtu_no_confirm(skb, mtu); |
| 417 | |
| 418 | if (!reply || skb->pkt_type == PACKET_HOST) |
| 419 | return 0; |
| 420 | |
| 421 | if (skb->protocol == htons(ETH_P_IP)) |
| 422 | return iptunnel_pmtud_check_icmp(skb, mtu); |
| 423 | |
| 424 | #if IS_ENABLED(CONFIG_IPV6) |
| 425 | if (skb->protocol == htons(ETH_P_IPV6)) |
| 426 | return iptunnel_pmtud_check_icmpv6(skb, mtu); |
| 427 | #endif |
| 428 | return 0; |
| 429 | } |
| 430 | EXPORT_SYMBOL(skb_tunnel_check_pmtu); |
| 431 | |
| 432 | static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = { |
| 433 | [LWTUNNEL_IP_UNSPEC] = { .strict_start_type = LWTUNNEL_IP_OPTS }, |
| 434 | [LWTUNNEL_IP_ID] = { .type = NLA_U64 }, |
| 435 | [LWTUNNEL_IP_DST] = { .type = NLA_U32 }, |
| 436 | [LWTUNNEL_IP_SRC] = { .type = NLA_U32 }, |
| 437 | [LWTUNNEL_IP_TTL] = { .type = NLA_U8 }, |
| 438 | [LWTUNNEL_IP_TOS] = { .type = NLA_U8 }, |
| 439 | [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 }, |
| 440 | [LWTUNNEL_IP_OPTS] = { .type = NLA_NESTED }, |
| 441 | }; |
| 442 | |
| 443 | static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = { |
| 444 | [LWTUNNEL_IP_OPTS_GENEVE] = { .type = NLA_NESTED }, |
| 445 | [LWTUNNEL_IP_OPTS_VXLAN] = { .type = NLA_NESTED }, |
| 446 | [LWTUNNEL_IP_OPTS_ERSPAN] = { .type = NLA_NESTED }, |
| 447 | }; |
| 448 | |
| 449 | static const struct nla_policy |
| 450 | geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = { |
| 451 | [LWTUNNEL_IP_OPT_GENEVE_CLASS] = { .type = NLA_U16 }, |
| 452 | [LWTUNNEL_IP_OPT_GENEVE_TYPE] = { .type = NLA_U8 }, |
| 453 | [LWTUNNEL_IP_OPT_GENEVE_DATA] = { .type = NLA_BINARY, .len = 128 }, |
| 454 | }; |
| 455 | |
| 456 | static const struct nla_policy |
| 457 | vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = { |
| 458 | [LWTUNNEL_IP_OPT_VXLAN_GBP] = { .type = NLA_U32 }, |
| 459 | }; |
| 460 | |
| 461 | static const struct nla_policy |
| 462 | erspan_opt_policy[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1] = { |
| 463 | [LWTUNNEL_IP_OPT_ERSPAN_VER] = { .type = NLA_U8 }, |
| 464 | [LWTUNNEL_IP_OPT_ERSPAN_INDEX] = { .type = NLA_U32 }, |
| 465 | [LWTUNNEL_IP_OPT_ERSPAN_DIR] = { .type = NLA_U8 }, |
| 466 | [LWTUNNEL_IP_OPT_ERSPAN_HWID] = { .type = NLA_U8 }, |
| 467 | }; |
| 468 | |
| 469 | static int ip_tun_parse_opts_geneve(struct nlattr *attr, |
| 470 | struct ip_tunnel_info *info, int opts_len, |
| 471 | struct netlink_ext_ack *extack) |
| 472 | { |
| 473 | struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1]; |
| 474 | int data_len, err; |
| 475 | |
| 476 | err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, attr, |
| 477 | geneve_opt_policy, extack); |
| 478 | if (err) |
| 479 | return err; |
| 480 | |
| 481 | if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] || |
| 482 | !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] || |
| 483 | !tb[LWTUNNEL_IP_OPT_GENEVE_DATA]) |
| 484 | return -EINVAL; |
| 485 | |
| 486 | attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA]; |
| 487 | data_len = nla_len(attr); |
| 488 | if (data_len % 4) |
| 489 | return -EINVAL; |
| 490 | |
| 491 | if (info) { |
| 492 | struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len; |
| 493 | |
| 494 | memcpy(opt->opt_data, nla_data(attr), data_len); |
| 495 | opt->length = data_len / 4; |
| 496 | attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS]; |
| 497 | opt->opt_class = nla_get_be16(attr); |
| 498 | attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE]; |
| 499 | opt->type = nla_get_u8(attr); |
| 500 | info->key.tun_flags |= TUNNEL_GENEVE_OPT; |
| 501 | } |
| 502 | |
| 503 | return sizeof(struct geneve_opt) + data_len; |
| 504 | } |
| 505 | |
| 506 | static int ip_tun_parse_opts_vxlan(struct nlattr *attr, |
| 507 | struct ip_tunnel_info *info, int opts_len, |
| 508 | struct netlink_ext_ack *extack) |
| 509 | { |
| 510 | struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1]; |
| 511 | int err; |
| 512 | |
| 513 | err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, attr, |
| 514 | vxlan_opt_policy, extack); |
| 515 | if (err) |
| 516 | return err; |
| 517 | |
| 518 | if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP]) |
| 519 | return -EINVAL; |
| 520 | |
| 521 | if (info) { |
| 522 | struct vxlan_metadata *md = |
| 523 | ip_tunnel_info_opts(info) + opts_len; |
| 524 | |
| 525 | attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP]; |
| 526 | md->gbp = nla_get_u32(attr); |
| 527 | md->gbp &= VXLAN_GBP_MASK; |
| 528 | info->key.tun_flags |= TUNNEL_VXLAN_OPT; |
| 529 | } |
| 530 | |
| 531 | return sizeof(struct vxlan_metadata); |
| 532 | } |
| 533 | |
| 534 | static int ip_tun_parse_opts_erspan(struct nlattr *attr, |
| 535 | struct ip_tunnel_info *info, int opts_len, |
| 536 | struct netlink_ext_ack *extack) |
| 537 | { |
| 538 | struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1]; |
| 539 | int err; |
| 540 | u8 ver; |
| 541 | |
| 542 | err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr, |
| 543 | erspan_opt_policy, extack); |
| 544 | if (err) |
| 545 | return err; |
| 546 | |
| 547 | if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER]) |
| 548 | return -EINVAL; |
| 549 | |
| 550 | ver = nla_get_u8(tb[LWTUNNEL_IP_OPT_ERSPAN_VER]); |
| 551 | if (ver == 1) { |
| 552 | if (!tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX]) |
| 553 | return -EINVAL; |
| 554 | } else if (ver == 2) { |
| 555 | if (!tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] || |
| 556 | !tb[LWTUNNEL_IP_OPT_ERSPAN_HWID]) |
| 557 | return -EINVAL; |
| 558 | } else { |
| 559 | return -EINVAL; |
| 560 | } |
| 561 | |
| 562 | if (info) { |
| 563 | struct erspan_metadata *md = |
| 564 | ip_tunnel_info_opts(info) + opts_len; |
| 565 | |
| 566 | md->version = ver; |
| 567 | if (ver == 1) { |
| 568 | attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX]; |
| 569 | md->u.index = nla_get_be32(attr); |
| 570 | } else { |
| 571 | attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR]; |
| 572 | md->u.md2.dir = nla_get_u8(attr); |
| 573 | attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID]; |
| 574 | set_hwid(&md->u.md2, nla_get_u8(attr)); |
| 575 | } |
| 576 | |
| 577 | info->key.tun_flags |= TUNNEL_ERSPAN_OPT; |
| 578 | } |
| 579 | |
| 580 | return sizeof(struct erspan_metadata); |
| 581 | } |
| 582 | |
| 583 | static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info, |
| 584 | struct netlink_ext_ack *extack) |
| 585 | { |
| 586 | int err, rem, opt_len, opts_len = 0; |
| 587 | struct nlattr *nla; |
| 588 | __be16 type = 0; |
| 589 | |
| 590 | if (!attr) |
| 591 | return 0; |
| 592 | |
| 593 | err = nla_validate(nla_data(attr), nla_len(attr), LWTUNNEL_IP_OPTS_MAX, |
| 594 | ip_opts_policy, extack); |
| 595 | if (err) |
| 596 | return err; |
| 597 | |
| 598 | nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) { |
| 599 | switch (nla_type(nla)) { |
| 600 | case LWTUNNEL_IP_OPTS_GENEVE: |
| 601 | if (type && type != TUNNEL_GENEVE_OPT) |
| 602 | return -EINVAL; |
| 603 | opt_len = ip_tun_parse_opts_geneve(nla, info, opts_len, |
| 604 | extack); |
| 605 | if (opt_len < 0) |
| 606 | return opt_len; |
| 607 | opts_len += opt_len; |
| 608 | if (opts_len > IP_TUNNEL_OPTS_MAX) |
| 609 | return -EINVAL; |
| 610 | type = TUNNEL_GENEVE_OPT; |
| 611 | break; |
| 612 | case LWTUNNEL_IP_OPTS_VXLAN: |
| 613 | if (type) |
| 614 | return -EINVAL; |
| 615 | opt_len = ip_tun_parse_opts_vxlan(nla, info, opts_len, |
| 616 | extack); |
| 617 | if (opt_len < 0) |
| 618 | return opt_len; |
| 619 | opts_len += opt_len; |
| 620 | type = TUNNEL_VXLAN_OPT; |
| 621 | break; |
| 622 | case LWTUNNEL_IP_OPTS_ERSPAN: |
| 623 | if (type) |
| 624 | return -EINVAL; |
| 625 | opt_len = ip_tun_parse_opts_erspan(nla, info, opts_len, |
| 626 | extack); |
| 627 | if (opt_len < 0) |
| 628 | return opt_len; |
| 629 | opts_len += opt_len; |
| 630 | type = TUNNEL_ERSPAN_OPT; |
| 631 | break; |
| 632 | default: |
| 633 | return -EINVAL; |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | return opts_len; |
| 638 | } |
| 639 | |
| 640 | static int ip_tun_get_optlen(struct nlattr *attr, |
| 641 | struct netlink_ext_ack *extack) |
| 642 | { |
| 643 | return ip_tun_parse_opts(attr, NULL, extack); |
| 644 | } |
| 645 | |
| 646 | static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info, |
| 647 | struct netlink_ext_ack *extack) |
| 648 | { |
| 649 | return ip_tun_parse_opts(attr, info, extack); |
| 650 | } |
| 651 | |
| 652 | static int ip_tun_build_state(struct net *net, struct nlattr *attr, |
| 653 | unsigned int family, const void *cfg, |
| 654 | struct lwtunnel_state **ts, |
| 655 | struct netlink_ext_ack *extack) |
| 656 | { |
| 657 | struct nlattr *tb[LWTUNNEL_IP_MAX + 1]; |
| 658 | struct lwtunnel_state *new_state; |
| 659 | struct ip_tunnel_info *tun_info; |
| 660 | int err, opt_len; |
| 661 | |
| 662 | err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr, |
| 663 | ip_tun_policy, extack); |
| 664 | if (err < 0) |
| 665 | return err; |
| 666 | |
| 667 | opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack); |
| 668 | if (opt_len < 0) |
| 669 | return opt_len; |
| 670 | |
| 671 | new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len); |
| 672 | if (!new_state) |
| 673 | return -ENOMEM; |
| 674 | |
| 675 | new_state->type = LWTUNNEL_ENCAP_IP; |
| 676 | |
| 677 | tun_info = lwt_tun_info(new_state); |
| 678 | |
| 679 | err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack); |
| 680 | if (err < 0) { |
| 681 | lwtstate_free(new_state); |
| 682 | return err; |
| 683 | } |
| 684 | |
| 685 | #ifdef CONFIG_DST_CACHE |
| 686 | err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL); |
| 687 | if (err) { |
| 688 | lwtstate_free(new_state); |
| 689 | return err; |
| 690 | } |
| 691 | #endif |
| 692 | |
| 693 | if (tb[LWTUNNEL_IP_ID]) |
| 694 | tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]); |
| 695 | |
| 696 | if (tb[LWTUNNEL_IP_DST]) |
| 697 | tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]); |
| 698 | |
| 699 | if (tb[LWTUNNEL_IP_SRC]) |
| 700 | tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]); |
| 701 | |
| 702 | if (tb[LWTUNNEL_IP_TTL]) |
| 703 | tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]); |
| 704 | |
| 705 | if (tb[LWTUNNEL_IP_TOS]) |
| 706 | tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]); |
| 707 | |
| 708 | if (tb[LWTUNNEL_IP_FLAGS]) |
| 709 | tun_info->key.tun_flags |= |
| 710 | (nla_get_be16(tb[LWTUNNEL_IP_FLAGS]) & |
| 711 | ~TUNNEL_OPTIONS_PRESENT); |
| 712 | |
| 713 | tun_info->mode = IP_TUNNEL_INFO_TX; |
| 714 | tun_info->options_len = opt_len; |
| 715 | |
| 716 | *ts = new_state; |
| 717 | |
| 718 | return 0; |
| 719 | } |
| 720 | |
| 721 | static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate) |
| 722 | { |
| 723 | #ifdef CONFIG_DST_CACHE |
| 724 | struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); |
| 725 | |
| 726 | dst_cache_destroy(&tun_info->dst_cache); |
| 727 | #endif |
| 728 | } |
| 729 | |
| 730 | static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb, |
| 731 | struct ip_tunnel_info *tun_info) |
| 732 | { |
| 733 | struct geneve_opt *opt; |
| 734 | struct nlattr *nest; |
| 735 | int offset = 0; |
| 736 | |
| 737 | nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE); |
| 738 | if (!nest) |
| 739 | return -ENOMEM; |
| 740 | |
| 741 | while (tun_info->options_len > offset) { |
| 742 | opt = ip_tunnel_info_opts(tun_info) + offset; |
| 743 | if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS, |
| 744 | opt->opt_class) || |
| 745 | nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) || |
| 746 | nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4, |
| 747 | opt->opt_data)) { |
| 748 | nla_nest_cancel(skb, nest); |
| 749 | return -ENOMEM; |
| 750 | } |
| 751 | offset += sizeof(*opt) + opt->length * 4; |
| 752 | } |
| 753 | |
| 754 | nla_nest_end(skb, nest); |
| 755 | return 0; |
| 756 | } |
| 757 | |
| 758 | static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb, |
| 759 | struct ip_tunnel_info *tun_info) |
| 760 | { |
| 761 | struct vxlan_metadata *md; |
| 762 | struct nlattr *nest; |
| 763 | |
| 764 | nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN); |
| 765 | if (!nest) |
| 766 | return -ENOMEM; |
| 767 | |
| 768 | md = ip_tunnel_info_opts(tun_info); |
| 769 | if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) { |
| 770 | nla_nest_cancel(skb, nest); |
| 771 | return -ENOMEM; |
| 772 | } |
| 773 | |
| 774 | nla_nest_end(skb, nest); |
| 775 | return 0; |
| 776 | } |
| 777 | |
| 778 | static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb, |
| 779 | struct ip_tunnel_info *tun_info) |
| 780 | { |
| 781 | struct erspan_metadata *md; |
| 782 | struct nlattr *nest; |
| 783 | |
| 784 | nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN); |
| 785 | if (!nest) |
| 786 | return -ENOMEM; |
| 787 | |
| 788 | md = ip_tunnel_info_opts(tun_info); |
| 789 | if (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version)) |
| 790 | goto err; |
| 791 | |
| 792 | if (md->version == 1 && |
| 793 | nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index)) |
| 794 | goto err; |
| 795 | |
| 796 | if (md->version == 2 && |
| 797 | (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) || |
| 798 | nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID, |
| 799 | get_hwid(&md->u.md2)))) |
| 800 | goto err; |
| 801 | |
| 802 | nla_nest_end(skb, nest); |
| 803 | return 0; |
| 804 | err: |
| 805 | nla_nest_cancel(skb, nest); |
| 806 | return -ENOMEM; |
| 807 | } |
| 808 | |
| 809 | static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type, |
| 810 | struct ip_tunnel_info *tun_info) |
| 811 | { |
| 812 | struct nlattr *nest; |
| 813 | int err = 0; |
| 814 | |
| 815 | if (!(tun_info->key.tun_flags & TUNNEL_OPTIONS_PRESENT)) |
| 816 | return 0; |
| 817 | |
| 818 | nest = nla_nest_start_noflag(skb, type); |
| 819 | if (!nest) |
| 820 | return -ENOMEM; |
| 821 | |
| 822 | if (tun_info->key.tun_flags & TUNNEL_GENEVE_OPT) |
| 823 | err = ip_tun_fill_encap_opts_geneve(skb, tun_info); |
| 824 | else if (tun_info->key.tun_flags & TUNNEL_VXLAN_OPT) |
| 825 | err = ip_tun_fill_encap_opts_vxlan(skb, tun_info); |
| 826 | else if (tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT) |
| 827 | err = ip_tun_fill_encap_opts_erspan(skb, tun_info); |
| 828 | |
| 829 | if (err) { |
| 830 | nla_nest_cancel(skb, nest); |
| 831 | return err; |
| 832 | } |
| 833 | |
| 834 | nla_nest_end(skb, nest); |
| 835 | return 0; |
| 836 | } |
| 837 | |
| 838 | static int ip_tun_fill_encap_info(struct sk_buff *skb, |
| 839 | struct lwtunnel_state *lwtstate) |
| 840 | { |
| 841 | struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); |
| 842 | |
| 843 | if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id, |
| 844 | LWTUNNEL_IP_PAD) || |
| 845 | nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) || |
| 846 | nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) || |
| 847 | nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) || |
| 848 | nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) || |
| 849 | nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags) || |
| 850 | ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info)) |
| 851 | return -ENOMEM; |
| 852 | |
| 853 | return 0; |
| 854 | } |
| 855 | |
| 856 | static int ip_tun_opts_nlsize(struct ip_tunnel_info *info) |
| 857 | { |
| 858 | int opt_len; |
| 859 | |
| 860 | if (!(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT)) |
| 861 | return 0; |
| 862 | |
| 863 | opt_len = nla_total_size(0); /* LWTUNNEL_IP_OPTS */ |
| 864 | if (info->key.tun_flags & TUNNEL_GENEVE_OPT) { |
| 865 | struct geneve_opt *opt; |
| 866 | int offset = 0; |
| 867 | |
| 868 | opt_len += nla_total_size(0); /* LWTUNNEL_IP_OPTS_GENEVE */ |
| 869 | while (info->options_len > offset) { |
| 870 | opt = ip_tunnel_info_opts(info) + offset; |
| 871 | opt_len += nla_total_size(2) /* OPT_GENEVE_CLASS */ |
| 872 | + nla_total_size(1) /* OPT_GENEVE_TYPE */ |
| 873 | + nla_total_size(opt->length * 4); |
| 874 | /* OPT_GENEVE_DATA */ |
| 875 | offset += sizeof(*opt) + opt->length * 4; |
| 876 | } |
| 877 | } else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) { |
| 878 | opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_VXLAN */ |
| 879 | + nla_total_size(4); /* OPT_VXLAN_GBP */ |
| 880 | } else if (info->key.tun_flags & TUNNEL_ERSPAN_OPT) { |
| 881 | struct erspan_metadata *md = ip_tunnel_info_opts(info); |
| 882 | |
| 883 | opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_ERSPAN */ |
| 884 | + nla_total_size(1) /* OPT_ERSPAN_VER */ |
| 885 | + (md->version == 1 ? nla_total_size(4) |
| 886 | /* OPT_ERSPAN_INDEX (v1) */ |
| 887 | : nla_total_size(1) + |
| 888 | nla_total_size(1)); |
| 889 | /* OPT_ERSPAN_DIR + HWID (v2) */ |
| 890 | } |
| 891 | |
| 892 | return opt_len; |
| 893 | } |
| 894 | |
| 895 | static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate) |
| 896 | { |
| 897 | return nla_total_size_64bit(8) /* LWTUNNEL_IP_ID */ |
| 898 | + nla_total_size(4) /* LWTUNNEL_IP_DST */ |
| 899 | + nla_total_size(4) /* LWTUNNEL_IP_SRC */ |
| 900 | + nla_total_size(1) /* LWTUNNEL_IP_TOS */ |
| 901 | + nla_total_size(1) /* LWTUNNEL_IP_TTL */ |
| 902 | + nla_total_size(2) /* LWTUNNEL_IP_FLAGS */ |
| 903 | + ip_tun_opts_nlsize(lwt_tun_info(lwtstate)); |
| 904 | /* LWTUNNEL_IP_OPTS */ |
| 905 | } |
| 906 | |
| 907 | static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b) |
| 908 | { |
| 909 | struct ip_tunnel_info *info_a = lwt_tun_info(a); |
| 910 | struct ip_tunnel_info *info_b = lwt_tun_info(b); |
| 911 | |
| 912 | return memcmp(info_a, info_b, sizeof(info_a->key)) || |
| 913 | info_a->mode != info_b->mode || |
| 914 | info_a->options_len != info_b->options_len || |
| 915 | memcmp(ip_tunnel_info_opts(info_a), |
| 916 | ip_tunnel_info_opts(info_b), info_a->options_len); |
| 917 | } |
| 918 | |
| 919 | static const struct lwtunnel_encap_ops ip_tun_lwt_ops = { |
| 920 | .build_state = ip_tun_build_state, |
| 921 | .destroy_state = ip_tun_destroy_state, |
| 922 | .fill_encap = ip_tun_fill_encap_info, |
| 923 | .get_encap_size = ip_tun_encap_nlsize, |
| 924 | .cmp_encap = ip_tun_cmp_encap, |
| 925 | .owner = THIS_MODULE, |
| 926 | }; |
| 927 | |
| 928 | static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = { |
| 929 | [LWTUNNEL_IP6_UNSPEC] = { .strict_start_type = LWTUNNEL_IP6_OPTS }, |
| 930 | [LWTUNNEL_IP6_ID] = { .type = NLA_U64 }, |
| 931 | [LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) }, |
| 932 | [LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) }, |
| 933 | [LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 }, |
| 934 | [LWTUNNEL_IP6_TC] = { .type = NLA_U8 }, |
| 935 | [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 }, |
| 936 | [LWTUNNEL_IP6_OPTS] = { .type = NLA_NESTED }, |
| 937 | }; |
| 938 | |
| 939 | static int ip6_tun_build_state(struct net *net, struct nlattr *attr, |
| 940 | unsigned int family, const void *cfg, |
| 941 | struct lwtunnel_state **ts, |
| 942 | struct netlink_ext_ack *extack) |
| 943 | { |
| 944 | struct nlattr *tb[LWTUNNEL_IP6_MAX + 1]; |
| 945 | struct lwtunnel_state *new_state; |
| 946 | struct ip_tunnel_info *tun_info; |
| 947 | int err, opt_len; |
| 948 | |
| 949 | err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr, |
| 950 | ip6_tun_policy, extack); |
| 951 | if (err < 0) |
| 952 | return err; |
| 953 | |
| 954 | opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack); |
| 955 | if (opt_len < 0) |
| 956 | return opt_len; |
| 957 | |
| 958 | new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len); |
| 959 | if (!new_state) |
| 960 | return -ENOMEM; |
| 961 | |
| 962 | new_state->type = LWTUNNEL_ENCAP_IP6; |
| 963 | |
| 964 | tun_info = lwt_tun_info(new_state); |
| 965 | |
| 966 | err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack); |
| 967 | if (err < 0) { |
| 968 | lwtstate_free(new_state); |
| 969 | return err; |
| 970 | } |
| 971 | |
| 972 | if (tb[LWTUNNEL_IP6_ID]) |
| 973 | tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]); |
| 974 | |
| 975 | if (tb[LWTUNNEL_IP6_DST]) |
| 976 | tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]); |
| 977 | |
| 978 | if (tb[LWTUNNEL_IP6_SRC]) |
| 979 | tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]); |
| 980 | |
| 981 | if (tb[LWTUNNEL_IP6_HOPLIMIT]) |
| 982 | tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]); |
| 983 | |
| 984 | if (tb[LWTUNNEL_IP6_TC]) |
| 985 | tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]); |
| 986 | |
| 987 | if (tb[LWTUNNEL_IP6_FLAGS]) |
| 988 | tun_info->key.tun_flags |= |
| 989 | (nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]) & |
| 990 | ~TUNNEL_OPTIONS_PRESENT); |
| 991 | |
| 992 | tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6; |
| 993 | tun_info->options_len = opt_len; |
| 994 | |
| 995 | *ts = new_state; |
| 996 | |
| 997 | return 0; |
| 998 | } |
| 999 | |
| 1000 | static int ip6_tun_fill_encap_info(struct sk_buff *skb, |
| 1001 | struct lwtunnel_state *lwtstate) |
| 1002 | { |
| 1003 | struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); |
| 1004 | |
| 1005 | if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id, |
| 1006 | LWTUNNEL_IP6_PAD) || |
| 1007 | nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) || |
| 1008 | nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) || |
| 1009 | nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) || |
| 1010 | nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) || |
| 1011 | nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags) || |
| 1012 | ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info)) |
| 1013 | return -ENOMEM; |
| 1014 | |
| 1015 | return 0; |
| 1016 | } |
| 1017 | |
| 1018 | static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate) |
| 1019 | { |
| 1020 | return nla_total_size_64bit(8) /* LWTUNNEL_IP6_ID */ |
| 1021 | + nla_total_size(16) /* LWTUNNEL_IP6_DST */ |
| 1022 | + nla_total_size(16) /* LWTUNNEL_IP6_SRC */ |
| 1023 | + nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */ |
| 1024 | + nla_total_size(1) /* LWTUNNEL_IP6_TC */ |
| 1025 | + nla_total_size(2) /* LWTUNNEL_IP6_FLAGS */ |
| 1026 | + ip_tun_opts_nlsize(lwt_tun_info(lwtstate)); |
| 1027 | /* LWTUNNEL_IP6_OPTS */ |
| 1028 | } |
| 1029 | |
| 1030 | static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = { |
| 1031 | .build_state = ip6_tun_build_state, |
| 1032 | .fill_encap = ip6_tun_fill_encap_info, |
| 1033 | .get_encap_size = ip6_tun_encap_nlsize, |
| 1034 | .cmp_encap = ip_tun_cmp_encap, |
| 1035 | .owner = THIS_MODULE, |
| 1036 | }; |
| 1037 | |
| 1038 | void __init ip_tunnel_core_init(void) |
| 1039 | { |
| 1040 | /* If you land here, make sure whether increasing ip_tunnel_info's |
| 1041 | * options_len is a reasonable choice with its usage in front ends |
| 1042 | * (f.e., it's part of flow keys, etc). |
| 1043 | */ |
| 1044 | BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255); |
| 1045 | |
| 1046 | lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP); |
| 1047 | lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6); |
| 1048 | } |
| 1049 | |
| 1050 | DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt); |
| 1051 | EXPORT_SYMBOL(ip_tunnel_metadata_cnt); |
| 1052 | |
| 1053 | void ip_tunnel_need_metadata(void) |
| 1054 | { |
| 1055 | static_branch_inc(&ip_tunnel_metadata_cnt); |
| 1056 | } |
| 1057 | EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata); |
| 1058 | |
| 1059 | void ip_tunnel_unneed_metadata(void) |
| 1060 | { |
| 1061 | static_branch_dec(&ip_tunnel_metadata_cnt); |
| 1062 | } |
| 1063 | EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata); |
| 1064 | |
| 1065 | /* Returns either the correct skb->protocol value, or 0 if invalid. */ |
| 1066 | __be16 ip_tunnel_parse_protocol(const struct sk_buff *skb) |
| 1067 | { |
| 1068 | if (skb_network_header(skb) >= skb->head && |
| 1069 | (skb_network_header(skb) + sizeof(struct iphdr)) <= skb_tail_pointer(skb) && |
| 1070 | ip_hdr(skb)->version == 4) |
| 1071 | return htons(ETH_P_IP); |
| 1072 | if (skb_network_header(skb) >= skb->head && |
| 1073 | (skb_network_header(skb) + sizeof(struct ipv6hdr)) <= skb_tail_pointer(skb) && |
| 1074 | ipv6_hdr(skb)->version == 6) |
| 1075 | return htons(ETH_P_IPV6); |
| 1076 | return 0; |
| 1077 | } |
| 1078 | EXPORT_SYMBOL(ip_tunnel_parse_protocol); |
| 1079 | |
| 1080 | const struct header_ops ip_tunnel_header_ops = { .parse_protocol = ip_tunnel_parse_protocol }; |
| 1081 | EXPORT_SYMBOL(ip_tunnel_header_ops); |
| 1082 | |
| 1083 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
| 1084 | bool ip_tunnel_netlink_encap_parms(struct nlattr *data[], |
| 1085 | struct ip_tunnel_encap *encap) |
| 1086 | { |
| 1087 | bool ret = false; |
| 1088 | |
| 1089 | memset(encap, 0, sizeof(*encap)); |
| 1090 | |
| 1091 | if (!data) |
| 1092 | return ret; |
| 1093 | |
| 1094 | if (data[IFLA_IPTUN_ENCAP_TYPE]) { |
| 1095 | ret = true; |
| 1096 | encap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); |
| 1097 | } |
| 1098 | |
| 1099 | if (data[IFLA_IPTUN_ENCAP_FLAGS]) { |
| 1100 | ret = true; |
| 1101 | encap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); |
| 1102 | } |
| 1103 | |
| 1104 | if (data[IFLA_IPTUN_ENCAP_SPORT]) { |
| 1105 | ret = true; |
| 1106 | encap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); |
| 1107 | } |
| 1108 | |
| 1109 | if (data[IFLA_IPTUN_ENCAP_DPORT]) { |
| 1110 | ret = true; |
| 1111 | encap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); |
| 1112 | } |
| 1113 | |
| 1114 | return ret; |
| 1115 | } |
| 1116 | EXPORT_SYMBOL_GPL(ip_tunnel_netlink_encap_parms); |